Harbour Investments’s Prothena Corp PRTA Stock Holding History

Harbour Investments’s Portfolio PRTA Stock Details PRTA Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$10	Hold	1	–	–	﹤0.01%	4738
2026 Q1	$10	Hold	1	–	–	﹤0.01%	4641
2025 Q4	$10	Hold	1	–	–	﹤0.01%	3842
2025 Q3	$10	Hold	1	–	–	﹤0.01%	3723
2025 Q2	$6	Sell	1 -2	-67%	-$15	﹤0.01%	3592
2025 Q1	$37	Buy	3 +2	+200%	+$28	﹤0.01%	3509
2024 Q4	$14	Hold	1	–	–	﹤0.01%	3465
2024 Q3	$17	Hold	1	–	–	﹤0.01%	3370
2024 Q2	$21	Hold	1	–	–	﹤0.01%	3262
2024 Q1	$25	Hold	1	–	–	﹤0.01%	3193
2023 Q4	$36	Sell	1 -4	-80%	-$154	﹤0.01%	3096
2023 Q3	$241	Hold	5	–	–	﹤0.01%	2869
2023 Q2	$341	Hold	5	–	–	﹤0.01%	2856
2023 Q1	$242	Hold	5	–	–	﹤0.01%	2863
2022 Q4	$301	Hold	5	–	–	﹤0.01%	2846
2022 Q3	$0	Hold	5	–	–	﹤0.01%	2805
2022 Q2	$0	Buy	+5	New	+$146	﹤0.01%	2805
2021 Q4	$0	Hold	4	–	–	﹤0.01%	3438
2021 Q3	$0	Hold	4	–	–	﹤0.01%	3919
2021 Q2	$0	Hold	4	–	–	﹤0.01%	3916
2021 Q1	$0	Buy	+4	New	+$75	﹤0.01%	3694

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Harbour Investments's PRTA Position: Q2 2026 in Review

Harbour Investments held its Prothena Corp (PRTA) position steady in Q2 2026 at 1 share worth $10. The position accounts for ﹤0.01% of the portfolio, ranked #4738.

Harbour Investments first reported a position in PRTA in Q1 2021 and has held it in 21 quarters since. The position peaked at $341 in Q2 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Harbour Investments held 1 share of Prothena Corp worth $10 as of Q2 2026.
Harbour Investments left its Prothena Corp share count unchanged in Q2 2026.
Prothena Corp made up ﹤0.01% of Harbour Investments's portfolio in Q2 2026, its #4738 holding.
Harbour Investments first reported a position in Prothena Corp in Q1 2021 and has held it in 21 quarters since.
Harbour Investments's Prothena Corp position peaked at $341 in Q2 2023.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Harbour Investments's 13F filing for Q2 2026, filed 12 Aug 2026.